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BAY CITY, Mich. -- Bay City officials are searching for the source of a water main break that is draining 10 million gallons of water a day and threatening to empty reserves by Monday in the Michigan city of 35,000.

The Bay City Timessays public works Director Dave Harran is urging residents and businesses to avoid all unnecessary water use.

Harran says crews discovered Saturday afternoon that there was a major water main break and searched all night for its location without success.

Bay City water and sewer system supervisor Gary Korthals said Sunday that crews were inspecting four water mains that run under the Saginaw River to see if any of them is the source of the leak.

He says repairing an underwater fracture would be "a major repair project."

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